Tetra w/ Diploid?

Tetra w/ Diploid?
I have been working with some crosses this year trying to mix Tretraploidi hosta
with the standard Diploidi type. I have had no luck getting the seed to set. On
the same stem when I've crossed with other Diploidi hosta I've had no trouble,
except in the case of Don Quixote which todate has set no seed. Is there a genetic
incompatability or is it simply a 'tougher' set to make.
Also I am wondering if there are any Streaked Tetra type hosta out there. I have
seen none labled as such.
Thanks Much
Mike
Milwaukee
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